Golf club reference system

ABSTRACT

The present invention relates to a golf club reference system having improved performance in accurate hitting of a golf ball by providing the most ideal, accurate angle of a golf club at a starting point, by matching a lie angle and a socket angle when addressing. The golf club reference system of the present invention installed on a hosel installed on a club head having a hitting surface or a shaft having a handle formed in an upper portion and connected to the hosel in an lower portion, the reference system comprising: a fixing ring surrounding the hosel or the shaft, a fixing screw shaft protruding from the fixing ring in one direction; a fixing nut fixing the fixing screw shaft; a display part connected to the fixing ring through a bridge, and a color crosshair formed on an upper portion of the display part.

FIELD OF THE INVENTION

The present invention relates to a golf club reference system, and more particularly, to a golf club reference system having improved performance in accurate hitting of a golf ball by providing the most ideal, accurate angle of a golf club at a starting point, by matching a lie angle and a socket angle when addressing using a golf club such as an iron, a driver, and a putter used on tee, fairway, and green.

BACKGROUND OF THE INVENTION

When hitting a golf ball, a golfer adjusts a golf club for a proper swing. However, even if the golfer attempts to control the swing of the golf club, a golf club head is likely to move like a free body at a certain speed. Most of energy of the moving club is transferred to the golf ball in an instant, and the golf ball compressed by a hitting surface of the golf club bounces forward while returning to its original spherical shape.

The most important factor for an ideal hitting of a golf ball is a hitting point of a hitting surface of the club head with respect to the golf ball. For ideal hitting, the hitting point should be below a center of the club head. If a golfer places the center of the club head below a center of the golf ball, a hitting angle can increase, and the golf ball can be hit more perfectly.

Since recent decades, many golf clubs have been manufactured to have a certain club head called “a club head with a heavy bottom portion” and allow golfers to easily achieve the object mentioned above.

By designing most of mass of the golf club to be concentrated on the bottom portion, a center of gravity of the club head is positioned in a lower portion, thereby allowing the golfer to easily place the center of the club head at a lower point than the center of the golf ball.

There are other important factors for the ideal hitting. A first factor is to position the hitting point of the hitting surface of the club head to be ideally aligned with the center of the club head and the center of the golf ball in a straight line.

As a second factor, the hitting surface of the club head must be perpendicular to a planned flight path of the golf ball. When the center of the club head, the hitting point, the center of the golf ball are on a single vertical plane, this vertical plane can be more precisely aligned with the planned flight path. Thus, the club head can be accurately perpendicular to the planned flight path when this theoretical vertical plane containing these three points is aligned with the planned flight path of the golf ball.

As a third factor, since each golfer has a different body shape and physical constitution, a point where a lie angle and a socket angle match with each other can be the most ideal starting point, or a reference point, when addressing.

Deviation from an ideal alignment of the three points reduces a maximum energy transfer effect when hitting, and deviation from a perpendicular arrangement causes the golf ball to deviate from the planned flight path.

The following example is intended to provide a complete understanding of the alignment and the perpendicular arrangement. First, if the three points are correctly aligned, but the club head is not perpendicular to the planned flight path of the golf ball, the maximum energy is transmitted to the golf ball, but an actual flight path of the golf ball deviates from the planned flight path. In a second case, if the club head is positioned to be perpendicular to the planned flight path of the golf ball, but the three points are not correctly aligned in that the hitting point is positioned at a front portion or a rear portion of the club head and deviates laterally, an amount of energy transferred to the golf ball is less than the maximum amount. In this case, the golf ball does not fly in a perfect flight path and cannot fly far. In addition, the club head may rotate or twist in this case, and the rotation or twist also changes the perpendicular arrangement.

The term rotation or twist denotes rotation of the club head, which rotates with respect to an axis passing through the center of the club head and being parallel to an axis of a golf club shaft, when the golf ball is hit.

Even for highly skilled and experienced golfers, it is very difficult to achieve the perfect alignment and perpendicular arrangement. Therefore, most golf clubs are designed in such a way that most of mass is relatively concentrated on a rear and a front portion of the club head. That is, by designing an iron golf club head to have an increased moment of inertia and maximize an energy transfer effect, rotation caused by misaligned hitting of the golf ball can be inhibited and prevented.

The conventional iron club heads are designed in general ways mentioned above to optimize a rotation prevention property and to successfully achieve this object in various club heads. A basic technology applied in various ways in the conventional iron club heads is to redistribute mass by forming a central recess portion on a back surface of the head or by forming a recess portion at predetermined portions and locations on the club head.

Another technology is to form a relatively small recess portion on the back surface of the club head to redistribute the mass of the small recess portion and to concentrate the mass on a predetermined location on the front and rear of the club head.

In addition, according to other design parameters, the rotation prevention property of the iron club head is determined by mass redistributed or concentrated on the rear and front portion of the club head, a mass concentration ratio, and position. As mentioned above, a lot of prior arts have attempted to optimize the rotation prevention property.

Accordingly, it is desired to provide a new set of golf clubs having an iron head configured to provide an improved rotation prevention property over the prior art.

In order to improve this problem, Korean Patent Registration No. 2105267 (registered on Apr. 21, 2020), which was previously registered by the present applicant, discloses a golf club configured that a hosel is formed in a club head on which a hitting surface is formed, a shaft is fixed to an inside of the hosel, a reference system fixing groove is formed on an upper portion of the hosel, and a socket is formed with an insertion space in which a tank is fixed and separated. The golf club provides a structure that suggests an accurate point through a crosshair formed in a center portion of an upper portion of the golf club and allows a golfer to match a lie angle and a shaft angle through the reference system, thereby suggesting an accurate starting point to the golfer when addressing.

However, since this conventional technology has to be installed in all clubs in a process of installing it in the hosel, the reference system cannot be installed on an accurate position and causes inconvenience in installation. In addition, since a circular tank has to be assembled, it is very difficult to install the crosshair to match at the correct point. Furthermore, since a position of the reference system installed in the hosel moves while hitting, the reference point can be lost as a result, making it difficult to perform accurate hitting.

PRIOR ART DOCUMENT Patent Document

(Patent Document 0001) Korean Patent Registration No. 1965567 (Registered on Mar. 29, 2019)

(Patent Document 0002) Korean Utility Model Registration No. 0190194 (Registered on May 15, 2000)

(Patent Document 0003) Korean Patent Registration No. 1135883 (Registered on Apr. 5, 2012)

(Patent Document 0004) Korean Patent Registration No. 2105267 (Registered on Apr. 21, 2020)

DETAILED DESCRIPTION OF THE INVENTION Technical Problems

Therefore, the present invention has been devised to solve the conventional problems, and the object of the present invention is to provide a golf club reference system that is installed on a hosel or a shaft and suggests an accurate angle at a starting point where a lie angle and a shaft angle match with each other when addressing, thereby enabling a golfer to hit a golf ball accurately.

Another object of the present invention is to provide a golf club reference system that is integrally installed on a hosel or a shaft that is connected to a head of an iron, a driver, and various woods and putters, thereby suggesting an accurate starting point.

Another object of the present invention is to provide a golf club reference system that can provide an accurate reference position when installed on a hosel or a shaft and that can allow the fixed reference position not to change and always suggest the accurate reference by forming a crosshair above a protruding portion of the reference system.

SUMMARY OF THE INVENTION

The present invention provides a golf club reference system installed on any one of a hosel or a shaft, wherein the hosel is installed on a club head having a hitting surface that is formed below the shaft having a handle 14 formed in an upper portion thereof, wherein an inside of the hosel is connected to the shaft upward.

The golf club reference system includes a fixing ring surrounding any one of the hosel and the shaft, the fixing ring from which a fixing screw shaft protrudes in one direction.

The golf club reference system includes a fixing nut fixing the fixing screw shaft.

The golf club reference system may include a display part connected to the fixing ring through a bridge and a color crosshair formed on an upper portion of the display part.

The fixing ring may include a cutout portion formed in one direction, and the fixing screw shaft respectively protrudes from each of ends of the fixing ring 21 that are separated from each other by the cutout portion.

Rotation preventing protrusions may be installed to protrude on an inner circumference of the fixing ring at regular intervals to prevent the fixing ring from rotating.

The fixing ring may include a reference alignment part formed on a center of an upper portion thereof to guide an installation position accurately.

The display part may be formed in a cylindrical shape and is connected to the fixing ring through the bridge, and the color crosshair may be formed on an upper portion of the display part.

Each of the fixing ring, the bridge, and the display part may be formed in a state of being separated into a first and a second member, and fusion surfaces of the first and the second member of the fixing ring, the bridge, and the display part, may fusion to form the fixing ring, the bridge, and the display part.

Technical Effects of the Invention

The golf club reference system of the present invention can allow a golfer to hit a golf ball accurately when swinging and thus guide an accurate, ideal moving direction and path of the golf ball, by being installed on a hosel or a shaft and suggesting an accurate angle of a starting point where the lie angle and the shaft angle match with each other.

In addition, the golf club reference system of the present invention can match the lie angle and the shaft angle when addressing and suggest an accurate starting point, by being integrally installed on a hosel or a shaft that is connected to the club head of an iron, a driver, and various woods and putters.

Furthermore, the golf club reference system of the present invention can always enable accurate hitting of a golf ball, by providing an accurate reference position when installed on a hosel or a shaft and forming a crosshair above a protruding portion of the system to allow a fixed position not to change and always suggest an accurate reference.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view illustrating a desirable address state according to the present invention.

FIG. 2 is a front view illustrating an iron in a state in which a reference system is installed on a hosel thereof according to the present invention.

FIG. 3 is a side view illustrating an iron in a state in which a reference system is installed on a hosel thereof according to the present invention.

FIG. 4 is a front view illustrating a club head in a state in which a reference system is installed on a hosel thereof according to the present invention.

FIG. 5 is a side view illustrating a club head in a state in which a reference system is installed on a hosel thereof according to the present invention.

FIG. 6 is a top cross-sectional view illustrating a state in which a reference system is connected to a hosel according to the present invention.

FIG. 7 is a side cross-sectional view illustrating a state in which a reference system is connected to a hosel according to the present invention.

FIG. 8 is a top cross-sectional view illustrating a state in which a reference system is fixed to a hosel according to the present invention.

FIG. 9 is a side cross-sectional view illustrating a state in which a reference system is fixed to a hosel according to the present invention.

FIG. 10 is a top cross-sectional view illustrating a state in which a reference system is connected to a shaft according to the present invention.

FIG. 11 is a side cross-sectional view illustrating a state in which a reference system is connected to a shaft according to the present invention.

FIG. 12 is a top cross-sectional view illustrating a state in which a reference system is fixed to a shaft according to the present invention.

FIG. 13 is a side cross-sectional view illustrating a state in which a reference system is fixed to a shaft according to the present invention.

FIG. 14 is an exploded perspective view illustrating a molded state of a reference system according to the present invention.

FIG. 15 is a perspective view illustrating a molded state of a reference system according to the present invention.

DETAILED DESCRIPTION

The objects described above, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. The embodiments introduced herein are provided so that the disclosure may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to one of skilled in the art.

In this specification, when a component is described to be on another component, it may be directly formed on the other component, or a third component may be interposed therebetween. In addition, in the drawings, the thicknesses of components are exaggerated for effective explanation of the technical concept.

Embodiments described in the specification will be explained with reference to cross-sectional views and/or top views, which are ideal illustrative views of the present invention. In the drawings, the thicknesses of components and areas are exaggerated for effective explanation of the technical concept. Accordingly, the shapes in the illustrative drawing may be modified due to manufacturing technology and/or a manufacturing tolerance range. Therefore, the embodiments of the present invention are not limited to the specific form shown in the drawings, but also include changes and modifications in forms generated according to the manufacturing process. For example, an area illustrated as at right angles may be rounded or have a certain curvature. Accordingly, an area illustrated in the drawings have properties, and the shapes of the area illustrated in the drawings are intended to illustrate the specific shape of the area of the system and not to limit the scope of the invention. In various embodiments of the present specification, terms such as first and second are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless otherwise stated. The terms ‘comprise’ and/or ‘comprising’ do not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, various specific characteristics have been described to explain the invention and assist the understanding more specifically. However, one who has knowledge in this field enough to understand the present invention may recognize that the present invention can be used without these various specific characteristics. In describing the invention, parts that are commonly known and not closely related to the invention are not described to avoid confusion.

Hereinafter, the most preferred embodiment of the present invention will be described in more detail according to the accompanying drawings.

FIG. 1 is a front view illustrating a desirable address state according to the present invention. FIG. 2 is a front view illustrating an iron in a state in which a reference system is installed on a hosel thereof according to the present invention. FIG. 3 is a side view illustrating an iron in a state in which a reference system is installed on a hosel thereof according to the present invention. FIG. 4 is a front view illustrating a club head in a state in which a reference system is installed on a hosel thereof according to the present invention. FIG. 5 is a side view illustrating a club head in a state in which a reference system is installed on a hosel thereof according to the present invention.

Referring to FIGS. 1 to 5, a golf club may include a shaft 13 with handle 14 installed on an upper portion thereof; a club head 10 that is positioned below the shaft 13 and may be any one of driver and various woods, irons, and putters, and a hosel 12 that surrounds and is fixed to the shaft 13 to connect it to the club head 10. The reference system 20 is installed on an outer circumference of the hosel 12 or the shaft 13.

In an address posture where a hitting surface 11 of the club head 10 hits the golf ball 18, the reference system 20 may guide a correct angle of the club head 10. Accordingly, the golfer adjusts the angle of the club head 10 to find the correct angle where a lie angle and an angle of the reference system 20 match with each other. At this time, the golf club 10 may maintain an ideal angle of 45° based on a pitching shot.

The reference system 20 comprises: a fixing ring 21 surrounding an outer circumference of the hosel 12 or the shaft 13 positioned on an upper portion of the hosel 12; a fixing screw shaft 24 protruding from the fixing ring 21; a fixing nut 40 connected to the fixing screw shaft 24 to fix the fixing ring 21 to the hosel 12 or the shaft 13; a display part 30 connected to the fixing ring 21 and installed to provide a correct starting point in a state in which the hitting surface 11 of the club head 10 can hit the golf ball 18.

FIG. 6 is a top cross-sectional view illustrating a state in which a reference system is connected to a hosel according to the present invention. FIG. 7 is a side cross-sectional view illustrating a state in which a reference system is connected to a hosel according to the present invention. FIG. 8 is a top cross-sectional view illustrating a state in which a reference system is fixed to a hosel according to the present invention. FIG. 9 is a side cross-sectional view illustrating a state in which a reference system is fixed to a hosel according to the present invention. FIG. 10 is a top cross-sectional view illustrating a state in which a reference system is connected to a shaft according to the present invention. FIG. 11 is a side cross-sectional view illustrating a state in which a reference system is connected to a shaft according to the present invention. FIG. 12 is a top cross-sectional view illustrating a state in which a reference system is fixed to a shaft according to the present invention. FIG. 13 is a side cross-sectional view illustrating a state in which a reference system is fixed to a shaft according to the present invention.

Referring to FIGS. 6 to 13, the reference system 20 has the fixing ring 21 whose inner circumference changes variously to be installed on the outer circumference of the hosel 12 or the shaft 13 which have different outer circumferences.

In this case, the reference system 20 may be provided through a process of melting a synthetic resin material and injection-molding it in a mold. The fixing ring 21 having a circular shape is molded to surround and be fixed to the outer circumference of the hosel 12 or the shaft 13.

The circular fixing ring 21 may be molded to form rotation preventing protrusions 22 on the inner circumference thereof at regular intervals. The rotation preventing protrusions 22 may have a shape of any one of a semicircle, a square, a triangle, and a polygon. Meanwhile, a cutout portion 23 is formed in one direction of the fixing ring 21 to be opened, and the fixing screw shaft 24 is formed to respectively protrude outwardly from each of ends of the fixing ring 21 that are separated from each other by the cutout portion 23.

The fixing ring 21 is formed to be separated by about half or less of a circumference thereof at the cutout portion 23. The fixing screw shaft 24 is formed to protrude from the separated ends of the fixing ring 21 in an outward direction and have a male screw portion on an outer circumference thereof.

The fixing nut 40 is screw-coupled to the fixing screw shaft 24 from the outside of the fixing screw shaft 24.

It is preferable that the fixing nut 40 has a female screw portion 41 formed in an inner circumference thereof so as to be screw-coupled to the fixing screw shaft 24.

In a center portion of an upper portion of the fixing ring 21, a reference alignment part 25 is formed in a straight line so that the fixing ring 21 can be fixed in an accurate position. The reference alignment part 25 may be formed as a groove or a protrusion, and if necessary, may have any one of a variety of colors such as yellow or red, which is distinguished from the fixing ring 21.

A display part 30 is connected to the fixing ring 21 through the bridge 26 in front of the reference alignment part 25.

The display part 30 is preferably formed in any one of a cylindrical shape and a rectangular shape. An upper surface of the display part 30 may be in a horizontal form, and a lower surface of the display part 30 may be in a horizontal form or an inclined form according to a connection shape from the display part 30 to the fixing ring 21 through the bridge 26.

A thickness of the bridge 26 is thinner than those of the display part 30 and the fixing ring 21, and the bridge 26 is connected to the display part 30 and the fixing ring 21 at lower positions.

A colored crosshair 31 is formed on an upper portion of the display part 30. In this case, the colored crosshair 31 may have any one of a variety of colors, such as yellow or red, which are distinguished from the display part 30, by post-processing.

The colored crosshair 31 may protrude or be formed as a groove in a cross shape. If necessary, the crosshair 31 may be colored with fluorescent color, or a fluorescent tape may be attached to the crosshair 31.

FIG. 14 is an exploded perspective view illustrating a molded state of a reference system according to the present invention. FIG. 15 is a perspective view illustrating a molded state of a reference system according to the present invention.

The reference system 20 may be injection-molded to have an integral form in one independent form, and if necessary, a set of the fixing ring 21, the bridge 26, and the display part 30 may be formed to be halved to be a first member 60 and a second member 65, so that each of the fixing ring 21, the bridge 26, and the display part 30 is independently formed to be two members.

The first and second member 60, 65 have fusion surfaces 50, 55 at portions where the first and second member 60, 65 of the fixing ring 21, the bridge 26, and the display part 30 are separated from each other. The mold may be heated to melt the fusion surfaces 50, 55, or the fusion surfaces 50, 55 may be directly heated to melt. Then, the fusion surfaces 50, 55 come into contact with each other to fuse and be fixed into one piece, thereby completing the reference system 20.

The reference system of the present invention is formed with configurations described above. That is, the reference system for improving hitting accuracy when addressing of the present invention is configured to surround and be coupled to the hosel 12 to be fixed to the golf club as shown in FIGS. 1 to 9, or to surround and be coupled to the shaft 13 to be fixed to the golf club as shown in FIGS. 10 to 13.

After the reference system 20 is fixed to the hosel 12 or the shaft 13 in such a way that the display part 30 protrudes forward, when the golfer takes an address posture as shown in FIGS. 1 and 3, he can use the reference system 20 to find an accurate starting angle and point for an ideal, accurate hitting. That is, if the hitting surface 11 of the club head 10 faces the golf ball 18 and the bottom surface 15 of the club head 10 maintains an accurate angle with the ground, the color crosshair 31 of the reference system 20 is positioned at an exact center.

However, if the golfer does not locate the starting point of the correct angle according to the body shape, constitution, and characteristics of the address posture, the color crosshair 31 does not match with the center and deviates into one direction due to the wrong posture. Since the color crosshair 31 shows the deviation state, the golfer can immediately check his address posture with the naked eye.

As the colored crosshair 31 of the reference system 20 is misaligned and deviates into one direction in the address posture, the golfer is guided to correct the address posture by adjusting the colored crosshair 31 to be positioned at the center. As correcting the posture, the bottom surface 15 of the club head 10 is adjusted so that the lie angle and the angle of the display part 30 match with each other, thereby guiding the accurate starting point.

Therefore, in the address posture, through the adjusted state in which the color crosshair 31 of the reference system 20 is positioned at the center, the golfer can match the lie angle and the angle of the color crosshair 31 and be provided with the most accurate, ideal angle and the correct starting point so that the hitting surface 11 of the club head 10 can accurately hit the golf ball 18. Through the accurate starting point, the golf ball 18 can accurately hit the batted ball 11 and proceed in an accurate direction and trajectory.

The reference system 20 may be installed and used at a required position of either the hosel 12 or the shaft 13 of the golf club. The hosel 12 or the shaft 13 passes between the separated fixing screw shafts 24 and through the spread cutout portion 23 and is inserted into the fixing ring 21, and the fixing ring 21 surrounds to be coupled to the hosel 12 or the shaft 13. Then, the fixing ring 21 is fixed to the golf club in a state where the display part 30 faces forward at the center of an installation position, by using the reference alignment part 25 located on the center portion of the upper portion of the fixing ring 21 as an installation reference point. At this time, the female screw portion 41 of the fixing nut 40 is screw-coupled to the fixing screw shaft 24 so that the reference system 20 is firmly fixed and not separated from the golf club. Through these steps, fixing the reference system 20 to the golf club can be easily completed.

The fixing ring 21 includes rotation prevention protrusions 22 protruding on the inner circumference at regular intervals, and the rotation prevention protrusions 22 surround the hosel 12 or the shaft 13 to prevent rotation and sliding of the golf club and provide a strong fixation state. Accordingly, the installation position of the reference system 20 does not change and maintain a function of guiding the accurate starting point even when using the golf club for a long time.

The colored crosshair 31 is formed on the upper portion of the display part 30, which is installed on a front portion of the fixing ring 21 through the bridge 26. The crosshair 31 is installed so that the hosel 12, the shaft 13, and the reference system 20 can be aligned in a straight line and provides the most ideal angle, accurate starting point as a reference point in the address posture.

The color crosshair 31 may be provided in various colors and guide the lie angle and the angle of the display part 30 to match with each other, so that the golfer can position the golf club at the accurate angle.

Meanwhile, as shown in FIGS. 14 and 15, the entire reference system 20 of the present invention may be injection-molded in one integral body. In addition, the reference system 20 may be separated and molded in half into the first and second member 60, 65 and then the fusion surfaces 50, 55 of the first and second member 60, 65 are pressed together in a molten state to be integrally coupled to one body by fusion bonding. The fixing ring and the display part 30 are stably connected to each other through the bridge 26, thereby providing a very beautiful external appearance.

INDUSTRIAL APPLICABILITY

The reference system of the present invention can be positioned and surround at a correct position of the hosel or the shaft by using the reference alignment part and can be installed quickly and securely by using the fixing screw shaft. The colored crosshair installed on the upper portion of the display part connected to the fixing ring through the bridge can provide an accurate starting point where the lie angle and the angle of the display part match with each other in the address posture and enable a user to check it. That is, the reference system of the present invention is very useful in the field of golf in that it can provide an accurate, ideal starting point and enable a user to hit a golf ball with accuracy so that the ball can travel in an accurate direction and trajectory. 

What is claimed is:
 1. A golf club reference system installed on any one of a hosel 12 or a shaft 13, wherein the hosel 12 is installed on a club head 10 having a hitting surface 11 that is formed below the shaft 13 having a handle 14 formed in an upper portion thereof, wherein an inside of the hosel 12 is connected to the shaft 13 upward, the golf club reference system comprising: a fixing ring 21 surrounding any one of the hosel 12 and the shaft 13, a fixing screw shaft 24 protruding from the fixing ring 21 in one direction; a fixing nut 40 fixing the fixing screw shaft 24; a display part 30 connected to the fixing ring 21 through a bridge 26, and a color crosshair 31 formed on an upper portion of the display part
 30. 2. The golf club reference system of claim 1, wherein the fixing ring 21 includes a cutout portion 23 formed in one direction, and the fixing screw shaft 24 respectively protrudes from each of ends of the fixing ring 21 that are separated from each other by the cutout portion
 23. 3. The golf club reference system of claim 1, wherein rotation preventing protrusions 22 are installed to protrude on an inner circumference of the fixing ring 21 at regular intervals to prevent the fixing ring 21 from rotating.
 4. The golf club reference system of claim 1, wherein the fixing ring 21 includes a reference alignment part 25 formed on a center of an upper portion thereof to guide an installation position accurately.
 5. The golf club reference system of claim 1, wherein the display part 30 is formed in a cylindrical shape.
 6. The golf club reference system of claim 1, wherein a set of the fixing ring 21, the bridge 26, and the display part 30 is formed to be separated into a first and a second member 60, 65, wherein fusion surfaces 50, 55 of the first and the second member 60, 65 of the fixing ring 21, the bridge 26, and the display part 30, fusion to form one body of the fixing ring 21, the bridge 26, and the display part. 